Across
- 1. Brightness seen from earth
- 8. A blue-white core that is left behind cools and becomes this
- 9. large cloud of gas and dust containing an immense volume of material
- 11. Brightness the star would have if it were at a standard distance from earth
Down
- 2. first stage of a star's formation
- 3. Distance light travels in one year
- 4. Make a decision
- 5. A explosion of the stars blazing millions of times brighter
- 6. All of space and everything in it
- 7. The universe then exploded in what has been called this
- 10. To look over
- 12. group of single stars, star systems, star clusters, dust, and gas bound together by gravity